I'll take incompetence over a cover up any day.
So far, the inquiry shows that they go hand in hand.
IMO, what we have seen so far, is a sort of naivité and incompetence, on the part of the different security agencies, and politicians involved, to deal with a threat originating from a handful of people from another culture. Lack of understanding, and failure to understand what was developing in a timely fashion.
One particular bit that struck me was in a CBC TV news report where they showed a gathering of people being drilled for hatred and death towards another group in a foreign language.
The threat did not take the weight it was supposed to have, due to ignorance, and maybe PC to some extent. When the event unfolded, ass covering kicked into high gear.